[API Review]: Add 'fxml.version' to System Properties (Was: FXML version number)

Danno Ferrin danno.ferrin at shemnon.com
Fri Jul 5 09:59:11 PDT 2013

I may be coming into this a little late, but I have concerns about using
the default namespace for version identification.  I feel a namespaced
attribute in a namespace fixed across versions to identify the semantics
would be a better choice, i.e.:

<?import javafx.scene.control.*?>
<Button text="press me" xmlns:fx="http://javafx.com/fxml/1"

<?import javafx.scene.control.*?>
<Button text="press me" xmlns:fx="http://javafx.com/fxml/1"

My concern is that tool automation that is sensitive to fully qualified
names may have a difficult time interacting with what amounts to namespaces
that can arbitrarily changed underneath them.  As is stands the tools need
to look at namespace-aware attributes to determine some values (such as
fx:id) so simply turning off namespacing is a problematic choice already.
 One very problematic application would be XML diff tools, as making them
match some namespaces and not others can be difficult.  The entire document
would become a diff then since the FQ name of the root node is different.

On Fri, Jul 5, 2013 at 9:17 AM, Eric Le Ponner <eric.le.ponner at oracle.com>wrote:

> Hi Milan,
> This looks good.
> Note that, since b28, Scene Builder 1.1 now generates FXML files which
> include:
>         xmlns:fx="http://javafx.com/fxml/1"
>         xmlns="http://javafx.com/javafx/2.2"
> Scene Builder Next will do the same but using values from 'fxml.version'
> and 'javafx.version'.
> It may also use those variables to improve error report or version
> management (to be defined).
> Cheers.
> Eric
> > From: Milan Kubec <milan.kubec at oracle.com>
> > Subject: [API Review]: Add 'fxml.version' to System Properties (Was:
> FXML version number)
> > Date: July 1, 2013 7:01:12 AM PDT
> > To: "openjfx-dev at openjdk.java.net" <openjfx-dev at openjdk.java.net>
> > Reply-To: milan.kubec at oracle.com
> >
> > Hello,
> > I propose to add 'fxml.version' property to JVM System Properties to
> > store version of FXML specific version that is supported by FXML Loader.
> > The property would be more specific equivalent of 'javafx.version'
> > because these two versions won't advance simultaneously.
> >
> > Details about versioning and proposed namespaces are described in issue:
> > https://javafx-jira.kenai.com/browse/RT-28599
> >
> > Thanks for comments
> >
> >  Milan
> >
> >
> > Dne 7.6.2013 10:49, Milan Kubec napsal(a):
> >> Hello,
> >> I have implemented simple versioning for FXML documents in FXMLLoader,
> but without support in tools it won't be very useful. I have agreed with
> NetBeans and Scene Builder folks that they will include support for
> versioning too. Support means that they will produce document with two XML
> namespaces - one defines version of fx: prefixed elements and attributes
> (xmlns:fx; it's already there, just the version is appended) and the other
> of actual JavaFX API used to produce document (xmlns; default, no prefix).
> The first will be checked, because wrong version can cause failure. The
> latter is only informational, no strict checking of version is possible,
> but tools can suggest to upgrade runtime, translate document etc.
> >>
> >> JavaFX API version is stored in System Properties as "javafx.version".
> The open question is still where and how to store fxml version in code. I
> think that we could have also property for this purpose, e.g.
> "fxml.version" in System Properties. So far it's part of FXMLLoader API,
> which is probably not very fortunate. What do you think?
> >>
> >> Issue details: https://javafx-jira.kenai.com/browse/RT-28599
> >>
> >> Milan

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